CN103683687A - Turbonator grounding device and method - Google Patents
Turbonator grounding device and method Download PDFInfo
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- CN103683687A CN103683687A CN201310681862.0A CN201310681862A CN103683687A CN 103683687 A CN103683687 A CN 103683687A CN 201310681862 A CN201310681862 A CN 201310681862A CN 103683687 A CN103683687 A CN 103683687A
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Abstract
The invention discloses a turbonator grounding device and method. The turbonator grounding device comprises an RC unit and an electric brush unit, wherein one end of the RC unit is grounded, the other end of the RC unit is connected with the electric brush unit, and the electric brush unit is in electrical contact with an end axle of an exciting dynamo of a turbonator. By means of the technical scheme, since the RC unit is arranged between the end axle of the exciting dynamo of the turbonator and the ground, resistance can effectively eliminate electrostatic charges to reduce shaft currents; the adding of capacitance can reduce the specific value of shaft-to-ground capacitance and shaft-to-ground voltage, so that a high-frequency voltage peak is reduced.
Description
Technical field
The present invention relates to conduct electricity connection area, particularly, relate to a kind of turbo generator earthing device and method.
Background technology
With the large turbo-type generator group of static excitation system, the high-frequency pulse signal that its static excitation system produces is superimposed on basic shaft voltage can produce shaft voltage.The situation of the big or small random groups of shaft voltage is different and different.Usually, unit capacity is larger, and its air-gap flux is larger, the asymmetry of structure is also more obvious, and in magnetic field, the irregularity degree of harmonic component and core sataration degree and stator is also larger, and shaft voltage peak value is just higher.The waveform of shaft voltage has complicated harmonic component, adopts the unit of static controlled rectification excitation, in its shaft voltage waveform, has very high pulse component.
Along with the increase of unit capacity and the application of static excitation system, static excitation system has produced a kind of new shaft voltage, and it is that the amplitude that superposes on basic shaft voltage is that the low-frequency voltage of 60V and high frequency voltage that peak value is 30V form.The shaft current that turbine generator unit shaft voltage causes can cause very large harm, the event of the steam turbine axle journal that shaft voltage causes, bearing shell contact point electric burn.Turbine generator shaft voltage is higher, if do not processed, the serious bearing shell that even burns, causes larger economic loss.
For the shaft voltage on restriction generator, turbine rotor produces galvano-cautery fault to turbo generator bearing shell, most way be in steam turbine main shaft side with a grounding brush by the direct ground connection of macro-axis.Yet, because the speed of generator turbine end rotating shaft surface rotation is very high, existing grounding brush was often lost efficacy, and existing earthing device can not be eliminated high frequency shaft voltage peak value.
For the problems referred to above, in prior art, there is no good solution.
Summary of the invention
The object of this invention is to provide a kind of equipment and method, can effectively eliminate high frequency shaft voltage peak value.
To achieve these goals, the invention provides a kind of turbo generator earthing device, this device comprises: RC unit and brush unit, and wherein said RC unit is configured to one end ground connection, and the other end connects described brush unit; And described brush unit is configured to electrically contact with the exciter end axle of described turbo generator.
Alternatively, described brush unit comprises following element: brush holder, brush carrier and brush, and wherein said brush holder is configured to fixing described brush carrier, and is provided with insulating barrier between described brush holder and described brush carrier; And described brush carrier is configured to grip described brush.
Alternatively, wherein said insulating barrier is epoxy resin board.
Alternatively, wherein said device comprise two groups described in brush unit, described in two groups, brush unit is separately positioned on the journal centre both sides of described exciter end axle.
Alternatively, described RC unit comprises that resistance value in parallel is that resistance R and the capacitance of 500 Ω is the capacitor C of 10 μ f.
Another aspect of the present invention provides a kind of turbo generator earthing method, and the method comprises: between the exciter end axle of described turbo generator and ground, RC unit and brush unit are set; Configure described RC unit and make one end ground connection, the other end connects described brush unit; And configure described brush unit the exciter end axle of itself and described turbo generator is electrically contacted.
Alternatively, described brush unit comprises following element: brush holder, brush carrier and brush, wherein arrange described brush unit and comprise: described brush holder is configured to fixing described brush carrier; Between described brush holder and described brush carrier, insulating barrier is set, makes the insulating resistance value of described brush carrier be more than or equal to 0.5M Ω; And described brush carrier is configured to grip described brush.
Alternatively, wherein said insulating barrier is epoxy resin board.
Described RC unit comprises that resistance value in parallel is that resistance R and the capacitance of 500 Ω is the capacitor C of 10 μ f.
By technique scheme, between the exciter end axle of turbo generator and ground, RC unit is set, resistance can effectively be eliminated electrostatic charge and reduce shaft current, and electric capacity add the ratio that can reduce axle direct-to-ground capacitance voltage, reduce high frequency voltage peak value.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 forms structured flowchart according to the turbo generator earthing device of embodiment of the present invention;
Fig. 2 is the turbo generator earthing device structural representation according to embodiment of the present invention; And
Fig. 3 is the turbo generator earthing method flow chart according to embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
Fig. 1 forms structured flowchart according to the turbo generator earthing device of embodiment of the present invention.As shown in Figure 1, a kind of turbo generator earthing device 100 provided by the invention, comprising: RC unit 101 and brush unit 102, and wherein said RC unit 101 is configured to one end ground connection, and the other end connects described brush unit 102; And described brush unit 102 is configured to electrically contact with the exciter end axle of described turbo generator.
Pass through technique scheme, between the exciter end axle of turbo generator and ground, RC unit 101 is set, utilize resistance in RC unit 101 effectively to eliminate electrostatic charge and reduce shaft current, and electric capacity can reduce the ratio of axle direct-to-ground capacitance voltage, reduces high frequency voltage peak value.
Fig. 2 is the turbo generator earthing device structural representation according to embodiment of the present invention.For illustrative purpose, the contact position of the theory structure of RC unit 101 in Fig. 1 and earthing device 100 and the exciter end axle of turbo generator has been shown in Fig. 2, and the structure of not shown brush unit 102.Alternatively, brush unit 102 can have the general structure of this area center brush, for example, can comprise brush holder, brush carrier and brush (for example, carbon brush) etc.
In one embodiment, described RC unit 101 can comprise that resistance value in parallel can be the capacitor C of 10 μ f for resistance R and the capacitance of 500 Ω.500 Ω resistance can be limited in shaft current effectively within the scope of axle and the harmless several mA of bearing, and can prevent the foundation of DC potential, even if set up DC potential, also can be limited in enough low degree.The electric capacity of 10 μ f, can prevent all shaft voltages that produced by static excitation effectively.In one embodiment, can obtain stoping for for example resistance of 500 Ω by slide rheostat, it be the equivalent capacity of 10 μ f that the Parallel-connected Capacitor that is 1 μ f by ten capacitances becomes capacitance.
In one embodiment, described brush unit 102 can comprise following element: brush holder, brush carrier and brush, and wherein said brush holder can be configured to fixing described brush carrier, and can be provided with insulating barrier between described brush holder and described brush carrier; And described brush carrier can be configured to grip described brush.The object that insulating barrier is set is to make brush and ground good insulation, for example, has the insulation resistance that is more than or equal to 0.5M Ω.One preferred embodiment in, described insulating barrier can be epoxy resin board.Epoxy resin board is insulating material conventional in a kind of industry, by its thickness is selected, can obtain the insulation resistance needing.Preferably, when brush unit 102 is installed, can adjust brush carrier and brush by the gap between the exciter end axle of releasing by adjusting the installation site of brush holder and/or the thickness of insulating material, 5mm for example, and guarantee that brush moves freely in brush carrier.In addition, the elastic force of brush spring also should be adjusted, to guarantee brush and exciter end axle good contact.
In order to guarantee that brush contacts and make exciter end axle stress balance effectively, reliably with exciter end axle, in one embodiment, turbo generator earthing device according to the present invention can comprise that brush unit 102 described in 102, two groups of brush unit described in two groups is separately positioned on the journal centre both sides of described exciter end axle.One preferred embodiment in, two groups of brush unit 102 can be arranged on the position of relative 180 ° of the journal centre both sides of exciter end axle, every group of brush unit 102 comprises one group of brush holder, brush carrier and brush, and the brush of two groups of brush unit 102 can be connected with RC unit 101 after parallel connection.
Refer again to Fig. 2, it should be noted that, according to the turbo generator earthing device of embodiment of the present invention, can in steam turbine main shaft side (generator vapour side), the ground brush device of macro-axis ground connection be combined with of the prior art, when having obtained good technique effect, there is good equipment compatibility.
Fig. 3 is the turbo generator earthing method flow chart according to embodiment of the present invention.As shown in Figure 3, a kind of turbo generator earthing method that embodiment of the present invention provides, can comprise: S302 arranges RC unit and brush unit between the exciter end axle of turbo generator and ground; S304, configuration RC unit makes one end ground connection, and the other end connects brush unit; And S306, configuration brush unit electrically contacts the exciter end axle of itself and turbo generator.
Pass through technique scheme, between the exciter end axle of turbo generator and ground, RC unit is set, utilize resistance in RC unit effectively to eliminate electrostatic charge and reduce shaft current, and electric capacity can reduce the ratio of axle direct-to-ground capacitance voltage, reduces high frequency voltage peak value.
In one embodiment, the brush unit arranging in said method can comprise following element: brush holder, brush carrier and brush, wherein arrange described brush unit and comprise: described brush holder is configured to fixing described brush carrier; Between described brush holder and described brush carrier, insulating barrier is set, makes the insulating resistance value of described brush carrier be more than or equal to 0.5M Ω; And described brush carrier is configured to grip described brush.Preferably, wherein said insulating barrier is epoxy resin board.In one embodiment, can, by adjusting the thick insulating resistance value that obtains needs of insulating material, in method, can comprise and by adjusting the thickness of described insulating barrier, make the insulating resistance value of brush carrier be more than or equal to 0.5M Ω.Wherein, can use the megger of 500V to measure insulating resistance value.
Below in conjunction with an instantiation, to using, according to the result of use of turbo generator earthing device provided by the invention and method, describe.
The operational factor of certain generator in Liao Mou factory turbo generator set is shown in table 1.
Table 1
| Active power | Reactive power | Stator voltage | Rotor voltage | Rotor current |
| 250.2MW | 52.3MVAR | 24KV | 6270A | 1697.9A |
The magnitude of voltage at each bearing shell place and shaft current value have for example been shown in table 2, by after this generator steam turbine main shaft side (, locating for 7 watts) ground connection.
Table 2
Maintenance generator steam turbine main shaft side joint ground has been shown in table 3, at generator, has encouraged side exciter end axle (for example, locating for 9 watts) simultaneously turbo generator earthing device, the magnitude of voltage at each bearing shell place and the shaft current value providing according to embodiment of the present invention is provided.
Table 3
Comparison sheet 2 and table 3, can find out, same generator used before and after the turbo generator earthing device providing according to embodiment of the present invention, and shaft voltage and shaft current reduced to effect obviously.Wherein shaft voltage is controlled at below 10V, lower than the puncture voltage of bearing shell oil film.Therefore, by turbo generator earthing device provided by the invention and method, can effectively reduce shaft voltage, eliminate electrostatic charge and reduce shaft current, and can reduce high frequency voltage peak value, guarantee turbo generator set safe operation.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned execution mode; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible compound modes.
In addition, between various execution mode of the present invention, also can carry out combination in any, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a turbo generator earthing device, this device comprises:
RC unit and brush unit, wherein
Described RC unit is configured to one end ground connection, and the other end connects described brush unit; And
Described brush unit is configured to electrically contact with the exciter end axle of described turbo generator.
2. device according to claim 1, wherein, described brush unit comprises following element: brush holder, brush carrier and brush, wherein
Described brush holder is configured to fixing described brush carrier, and is provided with insulating barrier between described brush holder and described brush carrier; And
Described brush carrier is configured to grip described brush.
3. device according to claim 2, wherein said insulating barrier is epoxy resin board.
4. device according to claim 2, wherein said device comprise two groups described in brush unit, described in two groups, brush unit is separately positioned on the journal centre both sides of described exciter end axle.
5. device according to claim 1, wherein, described RC unit comprises that resistance value in parallel is that resistance R and the capacitance of 500 Ω is the capacitor C of 10 μ f.
6. a turbo generator earthing method, the method comprises:
Between the exciter end axle of described turbo generator and ground, RC unit and brush unit are set;
Configure described RC unit and make one end ground connection, the other end connects described brush unit; And
Configuring described brush unit electrically contacts the exciter end axle of itself and described turbo generator.
7. method according to claim 6, wherein, described brush unit comprises following element: brush holder, brush carrier and brush, wherein arrange described brush unit and comprise:
Described brush holder is configured to fixing described brush carrier;
Between described brush holder and described brush carrier, insulating barrier is set, makes the insulating resistance value of described brush carrier be more than or equal to 0.5M Ω; And
Described brush carrier is configured to grip described brush.
8. method according to claim 7, wherein said insulating barrier is epoxy resin board.
9. method according to claim 7, is wherein separately positioned on brush unit described in two groups the journal centre both sides of described exciter end axle.
10. method according to claim 7, wherein, described RC unit comprises that resistance value in parallel is that resistance R and the capacitance of 500 Ω is the capacitor C of 10 μ f.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310681862.0A CN103683687A (en) | 2013-12-12 | 2013-12-12 | Turbonator grounding device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310681862.0A CN103683687A (en) | 2013-12-12 | 2013-12-12 | Turbonator grounding device and method |
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| CN103683687A true CN103683687A (en) | 2014-03-26 |
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| CN201310681862.0A Pending CN103683687A (en) | 2013-12-12 | 2013-12-12 | Turbonator grounding device and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548655A (en) * | 2015-12-07 | 2016-05-04 | 辽宁东科电力有限公司 | Device for monitoring and controlling shaft voltage and shaft current of turbo-generator online |
| CN105703547A (en) * | 2014-12-09 | 2016-06-22 | 罗伯特·博世有限公司 | electric machine having a potential equalization device |
| CN109324217A (en) * | 2017-08-01 | 2019-02-12 | 中广核研究院有限公司 | A kind of steam turbine generator shaft current and shaft voltage on-Line Monitor Device |
| CN110703090A (en) * | 2019-08-30 | 2020-01-17 | 江苏核电有限公司 | Generator shaft current detection device |
| CN110954753A (en) * | 2019-11-26 | 2020-04-03 | 中广核核电运营有限公司 | Device and method for measuring insulation to ground of excitation end sealing tile of generator |
| CN112234742A (en) * | 2020-10-26 | 2021-01-15 | 山东齐鲁电机制造有限公司 | Take RC earthing device's turbo generator brush support and supporting axle head thereof |
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| CN1400715A (en) * | 2001-07-27 | 2003-03-05 | 阿尔斯通（瑞士）有限公司 | Generator protecting monitor and its use |
| CN202444381U (en) * | 2012-03-13 | 2012-09-19 | 中国神华能源股份有限公司 | Rotating shaft grounding device for generator |
| WO2012168128A1 (en) * | 2011-06-08 | 2012-12-13 | Valeo Systemes D'essuyage | Carbon brush earth circuit |
| CN103138457A (en) * | 2011-11-25 | 2013-06-05 | 德昌电机(深圳)有限公司 | Motor and brush holder |
| CN203660770U (en) * | 2013-12-12 | 2014-06-18 | 中国神华能源股份有限公司 | Grounding device for steam-turbine generator |
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| CN1400715A (en) * | 2001-07-27 | 2003-03-05 | 阿尔斯通（瑞士）有限公司 | Generator protecting monitor and its use |
| WO2012168128A1 (en) * | 2011-06-08 | 2012-12-13 | Valeo Systemes D'essuyage | Carbon brush earth circuit |
| CN103138457A (en) * | 2011-11-25 | 2013-06-05 | 德昌电机(深圳)有限公司 | Motor and brush holder |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703547A (en) * | 2014-12-09 | 2016-06-22 | 罗伯特·博世有限公司 | electric machine having a potential equalization device |
| CN105703547B (en) * | 2014-12-09 | 2018-11-02 | 罗伯特·博世有限公司 | Motor with electric potential balancing device |
| CN105548655A (en) * | 2015-12-07 | 2016-05-04 | 辽宁东科电力有限公司 | Device for monitoring and controlling shaft voltage and shaft current of turbo-generator online |
| CN109324217A (en) * | 2017-08-01 | 2019-02-12 | 中广核研究院有限公司 | A kind of steam turbine generator shaft current and shaft voltage on-Line Monitor Device |
| CN110703090A (en) * | 2019-08-30 | 2020-01-17 | 江苏核电有限公司 | Generator shaft current detection device |
| CN110703090B (en) * | 2019-08-30 | 2022-04-19 | 江苏核电有限公司 | Generator shaft current detection device |
| CN110954753A (en) * | 2019-11-26 | 2020-04-03 | 中广核核电运营有限公司 | Device and method for measuring insulation to ground of excitation end sealing tile of generator |
| CN110954753B (en) * | 2019-11-26 | 2021-12-14 | 中广核核电运营有限公司 | Device and method for measuring insulation to ground of excitation end sealing tile of generator |
| CN112234742A (en) * | 2020-10-26 | 2021-01-15 | 山东齐鲁电机制造有限公司 | Take RC earthing device's turbo generator brush support and supporting axle head thereof |
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